I have used a less expensive brand surface cleaner put because it was made of plastic it was hard to keep down on the ground. This unit has a good weight that makes it easier to control with less fatigue. I’am using a 3000 PSI unit. The attached wheels allow easy control and if you get to close to the edge of a step the stiff brush will not allow the nozzles to bottom out and damage them. I do wish that the quick disconnect pipe was a bit larger diameter it just feels a little light duty for the weight of the cleaner. All that said have not had any problems.
Using a surface cleaner head is a great way to reduce overspray and mess when pressure washing. This one is well built with metal wheels; no dragging across the pavement all day. The only downside is that it does not wash the debris away from the washed area and the standing dirty water where you worked makes it a bit difficult to tell if you are done.